WiFi calling

Recently Sprint announced that the Galaxy Mini and another phone, not the Galaxy S4, would be getting the WiFi calling option... anyone know if the Galaxy S4 is capable of this and if there are plans to bring it to the S4?

Recently Sprint announced that the Galaxy Mini and another phone, not the Galaxy S4, would be getting the WiFi calling option... anyone know if the Galaxy S4 is capable of this and if there are plans to bring it to the S4?